-81=-3(3+4x)

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Solution for -81=-3(3+4x) equation: 



-81=-3(3+4x)

We move all terms to the left:

-81-(-3(3+4x))=0

We add all the numbers together, and all the variables

-(-3(4x+3))-81=0



We calculate terms in parentheses: -(-3(4x+3)), so:

-3(4x+3)

We multiply parentheses

-12x-9

Back to the equation:

-(-12x-9)



We get rid of parentheses

12x+9-81=0

We add all the numbers together, and all the variables

12x-72=0

We move all terms containing x to the left, all other terms to the right

12x=72

x=72/12

x=6

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